What caused Don Quixote to change in Chapter 1

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There is an older gentleman (named Quixana or perhaps Quesada) and he lives in a Spanish village called La Mancha. As the story begins, this man has lost his wits. "His imagination was full of all that he read in his books"stories of medieval knights, chivalry, and bloody battles. As a result, he changes his name to Don Quixote and decides to become a knight-errant.